I've never really used the rest command before, I've had no real reason to. I think this would get me to use the command. I don't think there's anything wrong with what you're suggesting, the only thing that will change is the amount of c-exp per hour people are going to be able to make, and frankly, for some guilds, that's not a bad thing.

I also think this adds another element to PK too, since people might be resting on a public healer, then you jump them. You'd have a slight advantage for a little while.